Yosoo Mini Adjustable Float Valve For Aquarium,RO DI Reverse Osmosis System Mini Plastic Adjustable Float Valve For Aquarium,RO DI Reverse Osmosis System Auto Fill Valve is perfect for both permanent and temporary installations. Non-toxic, tasteless, and can be used for drinking water. 3/8" BSP valve with 1/4" fitting. Adjustable float. This is the smallest adjustable float valve in the world.